Polar bear vs Saltwater Crocodile

Ursus maritimus compared with Crocodylus porosus

Key Differences

Polar bear is Vulnerable while Saltwater Crocodile is Least Concern.
Saltwater Crocodile is 2.2x heavier than Polar bear.
Saltwater Crocodile lives longer (70 years vs 25 years).

Taxonomic Classification

Rank	Polar bear	Saltwater Crocodile
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Mammalia (哺乳類)	Reptilia (爬虫類)
Order	Carnivora (ネコ目)	Crocodylia (Crocodilians)
Family	Ursidae (Bears)	Crocodylidae (Crocodiles)
Genus	Ursus (Bears)	Crocodylus (True Crocodiles)
Species	Ursus maritimus	Crocodylus porosus

Evolutionary Relationship

Polar bear and Saltwater Crocodile share a common ancestor at the Phylum level: Chordata. (脊索動物)

表示 Phylum: Chordata

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Saltwater Crocodile

LC — Least Concern

Population: ~300.0K

Trend: Stable →

Physical Characteristics

Attribute	Polar bear	Saltwater Crocodile
Diet	Carnivore	Carnivore
Average Lifespan	25 years	70 years
Average Length	2.4 m	6.0 m
Average Weight	450.0 kg	1.0 t

Habitat & Geographic Range

Polar bear

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Saltwater Crocodile

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Distributed across Australia, India, Indonesia, Malaysia, and Philippines.

Polar bear

地球上で最大の陸上肉食動物であるホッキョクグマは700kgを超えることがあり、カナダからロシアまでの北極海氷域全体に分布する。ワモンアザラシとヒゲアザラシを狩るために海氷に依存する高度に特化した海洋哺乳類である。広大な距離を泳ぐことができる優れた泳者でもある。脆弱種に指定されており、気候変動による急激な北極海氷の消失で個体群が深刻な圧力を受けている。